﻿/*
 * Copyright (c) 2009, Thiago M. Sayao <thiago.sayao@gmail.com>
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *  * Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  * Neither the name of the author nor the names of its contributors may be 
 *    used to endorse or promote products derived from this software without 
 *    specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 */

using System.Collections.Generic;
using System.Web.Mvc;
using System.Web.Routing;
using DotNetBurner.Core;

namespace DotNetBurner
{
    public static class GravatarHtmlHelper
    {

        public static string Gravatar (this HtmlHelper html, string email, int size)
        {
            return GetImageTag (GetGravatar (email, 
                                             new RouteValueDictionary{{"size", size}, 
                                                                      {"d", DotNetBurnerSettings.Settings.GravatarImage}}), 
                                             new Dictionary<string, object> {{"class", "gravatar"}, {"alt", "gravatar"}});
        }

        public static string Gravatar(this HtmlHelper html, string email)
        {
            return GetImageTag(GetGravatar(email));
        }

        public static string Gravatar(this HtmlHelper html, string email, 
                                      RouteValueDictionary gravatarAttributes)
        {
            return GetImageTag(GetGravatar(email, gravatarAttributes));
        }

        public static string Gravatar(this HtmlHelper html, string email, 
                                      RouteValueDictionary gravatarAttributes, 
                                      Dictionary<string, object> htmlAttributes)
        {
            return GetImageTag(GetGravatar(email, gravatarAttributes), htmlAttributes);
        }

        private static string GetImageTag(string source)
        {
            return GetImageTag(source, null);
        }

        private static string GetImageTag(string source, Dictionary<string, object> htmlAttributes)
        {
            string returnVal = "<img src=\"{0}\"";

            foreach (var attribute in htmlAttributes)
            {
                returnVal += string.Format(" {0}=\"{1}\"", attribute.Key, attribute.Value);
            }
            returnVal += " />";
            return string.Format(returnVal, source);
        }

        private static string GetGravatar(string email)
        {
            return string.Format("http://www.gravatar.com/avatar/{0}", email.EncryptMD5());
        }

        private static string GetGravatar(string email, RouteValueDictionary gravatarAttributes)
        {
            string returnVal = GetGravatar(email);
            bool first = true;

            foreach (var attribute in gravatarAttributes)
            {
                if (first)
                {
                    first = false;
                    returnVal += string.Format("?{0}={1}", attribute.Key, attribute.Value);
                    continue;
                }

                returnVal += string.Format("&{0}={1}", attribute.Key, attribute.Value);
            }

            return returnVal.AttributeEncode();
        }
    }
}